feat(aur): add AUR packaging and CI auto-publish

[eggfriedrice24]

Summary

• AUR package files for t3code-bin: PKGBUILD template, launcher script, .desktop entry
• CI job in the release workflow to auto-push updates to AUR on stable releases
• Based on how visual-studio-code-bin, signal-desktop-bin, etc. do it

Why

Yeah there's an auto-updater built in, but on Arch nobody wants to go download an AppImage, chmod it, shove it somewhere, and manage updates outside pacman. Having it on the AUR means you just paru -S t3code-bin or yay -S t3code-bin and you're done — updates come through normal system upgrades, desktop entry and icons just work, it's what people expect.

How it works

When a stable v*.*.* tag is pushed, after the GitHub Release goes up, a new publish_aur job kicks in:

1. Grabs the Linux AppImage build artifact
2. Computes its sha256
3. Generates the PKGBUILD from the template with the right version + checksum
4. Pushes it to the AUR via KSXGitHub/github-actions-deploy-aur@v4

Fully hands-off after initial setup.

One-time setup needed from maintainers

1. AUR account with an SSH public key registered
2. Initial t3code-bin package created on aur.archlinux.org
3. AUR_SSH_PRIVATE_KEY added as a secret in this repo's GitHub settings

Future

This gets Arch covered. Debian/Ubuntu .deb, Fedora .rpm, and eventually official Arch repos can come later as the project grows.

Test plan

• Build locally with makepkg -si on Arch
• Verify publish_aur job works on a test release
• Confirm installed package launches from app menu and CLI

Note

Add AUR packaging and CI auto-publish for t3code-bin

• Adds a PKGBUILD template for the t3code-bin AUR binary package, which fetches the AppImage from GitHub Releases, extracts it, and installs files into /opt/t3code-bin.
• Adds a launcher script that reads optional flags from ~/.config/t3code-flags.conf before executing the app, and a desktop entry for desktop environment integration.
• Adds a Publish AUR package job to the release workflow that computes the AppImage SHA256, populates the PKGBUILD template, and deploys to AUR on non-prerelease builds.

^{Macroscope summarized 9133f14.}

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